Yoke-retaining device

ABSTRACT

A device for positioning a deflection yoke about the gun portion of a cathode-ray tube. The yoke-retaining device is formed of a molded plastic material and has a collar or ring portion which is supported against the rear envelope of the tube by a series of integrally formed leg members. The collar portion has a series of integrally formed springlike tabs which project radially inwardly of the retainer to center the yoke within the ring. The tablike spring members hold the yoke firmly in directions transverse to the axis of the retainer, while permitting free movement of the yoke in the axial direction. A series of flanges are provided at the leg side of the collar portion to confine the yoke within the retaining device. Each of the flanges has a guide rib associated therewith extending in the axial direction at spaced points along the inner surface of the collar portion. These ribs prevent substantial pivoting of the yoke as it is being positioned within the yoke retainer.

United States Patent 1 Meier [4 1 Jan. 25, 1972 YOKE-RETAINING DEVICEABSTRACT [72] lnvemor; Jam Meier. Des p i m A device for positioning adeflection yoke about the gun portion of a cathode-ray tube. Theyoke-retaining device is Assign: Admll'fil Corporlfloni fl formed of amolded plastic material and has a collar or ring [22] Filed; No 6 1969portion which is supported against the rear envelope of the Appl. No.:874,528

Primary Examiner Robert Segal AtmrneyHill, Sherman, Meroni, Gross &Simpson tube by a series of integrally formed leg members. The collarportion has a series of integrally formed springlike tabs which projectradially inwardly of the retainer to center the yoke within the ring.The tablike spring members hold the yoke firmly in directions transverseto the axis of the retainer, while permitting free movement of the yokein the axial direction. A series of flanges are provided at the leg sideof the collar por tion to confine the yoke within the retaining device.Each of the flanges has a guide rib associated therewith extending inthe axial direction at spaced points along the inner surface of thecollar portion. These ribs prevent substantial pivoting of the yoke asit is being positioned within the yoke retainer.

1] Claims, 4 Drawing Figures YOKE-RETAINING DEVICE BACKGROUND OF THEINVENTION l. Description of the Prior Art Various means have beendevised for properly positioning a deflection yoke of a televisionreceiver about the gun portion of the cathode-ray tube. It is importantthat means be provided for properly positioning the yoke and retainingthe yoke in a fixed position once the proper position has beendetermined. The most common retaining devices utilized in televisionreceivers involve the use of a metal ring which is secured to theforward end of the cathode-ray tube by a series of springs. The yoke isthen secured to the metal ring by using a bolt or clamp-type fixturewhich tightens about the yoke and therefore holds the yoke firmly inplace. Such arrangements, however, are difficult to handle andinconsistent with today's trend to reduce the cost of televisionreceivers and especially of color television receivers. In addition, theremoval of the yoke from such prior art retaining devices is difficult,and the yoke must be reset in the proper position each time it isremoved and reassembled.

2. Field of the Invention The field of art to which this inventionpertains is retaining devices for deflection yokes of televisionreceivers and in particular to retaining devices for permanentlypositioning the yoke about the gun portion of a cathode-ray tube whileallowing easy removal and reassembly of the yoke SUMMARY OF THEINVENTION It is an important feature of the present invention to providea new improved and less costly yoke retaining device for a cathode-raytube.

It is another feature of the present invention to provide a one-piecemolded yoke structure.

It is a principal object of the present invention to provide a yokeretainer which can be permanently positioned about the gun portion of acathode-ray tube and act as a centering means and a supporting means fora deflection yoke.

It is another object of the present invention to provide a plasticlikeyoke retainer which has a series of integral tablike spring projectionsextending radially inwardly of the retainer to provide a permanentcentering means for the deflection yoke.

It is another object of the present invention to provide a moldedplastic yoke container having a collar portion and a series of legmembers extending generally axially away from the collar portion whereinthe leg members have contacting surfaces which are shaped generally toconform to the mating surface of the cathode-ray tube.

It is also an object of the present invention to provide a molded yokeretainer as described above wherein the retainer is secured to theassociated wall of the cathode-ray tube by pressure-sensitive tapemeans.

It is another object of the present invention to provide a moldedplastic yoke retainer as described above wherein the inner surface ofthe collar portion of the yoke retainer has guide ribs extendinggenerally axially of the collar portion and terminating in flanges whichact as stops for the positioning of the yoke within the retainer.

These and other objects, features and advantages of the presentinvention will be understood in greater detail from the followingdescription and the associated drawings, although variations andmodifications may be effected without departing from the spirit andscope of the novel concepts of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a top elevational view ofthe yoke retaining means of the present invention.

FIG. 2 is a side view of the yoke-retaining means shown in FIG. 1 andhaving a portion thereof cut away to illustrate the configuration of theinterior parts of the retainer.

FIG. 3 illustrates the orientation of a deflection yoke assembly and theyoke retainer just prior to placing the yoke within the yoke retainer.

FIG. 4 shows the method of positioning a yoke retainer about the gunportion of a cathode-ray tuber DESCRIPTION OF THE PREFERRED EMBODIMENTThe present invention pertains to a yoke-retaining device for atelevision receiver and in particular to a one-piece molded yokeretainer which effectively positions a yoke about the gun portion of acathode ray tube. The yoke of the present invention comprises a collarportion and a series of pad foot portions which support the retainer andthe yoke firmly against the rear envelope of the cathode-ray tube. Thecollar portion has a number of integrally formed springlike tabs whichextend radially inwardly of the collar portion to coact with the outersurface of the yoke when it is slid into position within the collarportion of the retainer.

The collar portion also has a series of flanges formed at the foot sidethereof which act as stops to limit the axial movement of the yoke as itis being positioned within the yoke retainer. These limit stops alsohave a series of guide ribs associated therewith. The guide ribs extendaxially of the flange stops along the inner surface of the collarportion and serve to prevent pivotal motions of the yoke as it is slidinto the retainer and thereby assure that the yoke will be held in position against the flange stops and not pass directly through the collarportion which would otherwise be possible.

The springlike tabs consist of U-shaped fingers supported on the collarportion of the retainer and are sufficiently resilient to deflect whenthe yoke is slid into the collar portion of the retainer.

The retainer itself is mounted to the rear envelope of the cathode-raytube by double-sided pressure-sensitive adhesive which is positionedbetween each of the pad foot portions of the retainer and the matingsurface of the picture tube envelope. Through such an arrangement asdescribed above, a yoke may be initially positioned in the retainer withthe retainer fixedly secured to the picture tube envelope in such a waythat the yoke may be then easily removed from the retainer andrepositioned without the necessity of resetting the position of the yokeabout the neck portion of the tube.

Referring to the drawings in greater detail, FIG. 1 shows the plasticmolded yoke retainer 10. The side view of the retainer 10 is shown inFIG. 2.

The retainer [0 has a collar portion II which essentially is a ring ofplasticlike material. The collar portion II has integrally formed footportions l2, l3, l4 and [5 which extend generally in an axial directionaway from the collar portion. The foot portions 12 through 15 are usedto mount the retainer [0 to the associated wall ofa cathode-ray tube. Inthis regard, the foot portions such as the foot portion I2 has a surfaceto which is shaped generally to conform to the configuration of themating part of the cathoderay tube. By placing a double-sidedpressuresensitive adhesive tape such as the tape I7 against the matingsurfaces of the foot portions 12 through IS. the ring can be rigidlyfastened to the backwall of the pic ture tube simply by slipping theretainer ring over the neck portion and applying pressure to theretainer against the backwall of the cathode-ray tube. Once the retaineris positioned against the backwall of the tube, it is essentiallyunremovable.

It is not necessary, however, to remove the retainer ring from thebackwall of the picture tube after it has been properly positioned. Thisis because the retainer, itself, has a series of tablike resilientmembers which are used to removably position the deflection yoke withinthe retainer ring. Therefore, while the retainer ring is permanentlypositioned about the neck of the tube, the yoke itself can be readilyremoved from the retainer ring and repositioned without difficulty.

The resilient tablike members such as the member [8 comprise a U-shapedprojection having one leg 22 of the U formed integrally with the collarportion ll of the retainer. The other leg 23 of the U projects radiallyinwardly of the retainer ring in a cantilever fashion. The leg 23 issufficiently resilient so that it will deflect as a yoke is slid intothe retainer.

By positioning a number of the resilient members 18 through 2]circumferentially about the collar portion II, a deflection yoke may beresiliently retained and centered within the yoke retainer 10. Also, theyoke may be readily removed and repositioned easily.

The collar portion ll is also provided with a series of flanges 24, 25,26 and 27. The flanges 24 through 27 are located intermediate adjacentones of the resilient tabs 18 through 21. As the yoke is slid into thecollar portion ll of the retaining ring, the outermost edge of the yokecontacts the flanges 24 through 27, and this prevents further forwardmovement of the yoke relative to the retainer 10.

Each of the flange stops 24 through 27 are provided with guide ribs 28,29, 30 and 3] which extend generally axially of the retainer ring. Theseguide ribs tend to prevent pivotal motion of the deflection yoke as itis being inserted in the retainer. Therefore, these ribs assist inassuring that the yoke will contact the flange stops 24 through 27squarely and not at an angle which might allow the deflection yoke topass directly through the retainer ring.

FIGS. 3 and 4 show the method of assembling the yoke into the retainerring and also show the method of mounting the retainer onto the gunportion or neck of a cathode-ray tube.

A standard deflection yoke 32 which includes an assembly 33 for holdinga number of circuit elements and a cone-shaped coil support 34. The coilsupport 34 has an outwardly projecting rim 35 which is receivable withinthe collar ll of the yoke retainer 10.

The outer perimeter 36 of the portion 35 is slid into the yoke retainer10 so that the face portion 37 thereof contacts the flanges 2S and 26.The flanges 25 and 26 stop the forward movement of the deflection yoke,and the resilient tabs 18 through 2! firmly hold the yoke in position inthe direction transverse to the axis of the collar ll.

in positioning the yoke within the retainer, the perimeter 36 is guidedinto position by the guide ribs 28 through 31.

Once the yoke 32 has been positioned properly within the yoke retainer10, the yoke retainer 10 is then ready to be permanently set intoposition about the neck of the picture tube. This is accomplished asshown in FIG. 4. In FIG. 4, an assembly of the yoke retainer 10 and theyoke 32 is shown in two positions, namely the initial position 38 priorto sliding the as' sembly onto the neck of the picture tube and thefinal assembled position 39.

The foot portions such as the foot portions 16 and [7 have apressure-sensitive adhesive applied thereto which permanently bonds theyoke retainer to the backwall of the picture tube. This is done bysliding the entire assembly with the deflection yoke in place in theretainer onto the neck of the picture tube. The deflection yoke andretainer are then positioned properly immediately adjacent to and spacedfrom the backwall of the picture tube. When the yoke is found to be inthe upper position, then pressure is applied to the yoke retainer whichpermanently bonds the foot portions through the adhesive to the backwallof the picture tube. Thereafter, the yoke 32 may be removed from theyoke retainer at will without disturbing the position of the yokeretainer at the backwall of the picture tube. When it is desired to lockthe yoke in position, a clamp 40 having a bolt 41 is tightened to crimpa plurality of fingers 42 about the neck 43 of the picture tube 44. Thefront end of the yoke is firmly positioned by the resilient tabs 18through 21 of the yoke retainer, and the yoke is locked into position bythe clamp mechanism 40 and 4].

lclaim: l. A device for positioning a deflection yoke about the gunportion of a cathode-ray tube comprising;

a retalner ring having a plurality of resilient yoke-centering meansspaced circumferentially thereabout for positioning a yoke internally ofthe ring, and means for securing the retainer ring about the gun portionof a cathode-ray tube, said resilient yoke-centering means being securedto a wall of the ring and protruding radially inwardly thereof to coactwith the deflection yoke for centering the same,

said deflection yoke being readily removably positionable within saidring against said resilient yoke-centering means.

2. A device for positioning a deflection yoke in accordance with claim Iwherein said resilient yoke-centering means is formed integrally withsaid retainer ring.

3. A device for positioning a deflection yoke in accordance with claim 2wherein said retainer ring has leg portions having surfaces shapedgenerally to conform to the mating surface areas of the cathode-ray 4. Adevice for positioning a deflection yoke about the gun portion of acathode-ray tube comprising:

a retainer ring formed of a thermoplastic substance and having aplurality of integral resilient portions extending radially inwardly ofthe ring for positioning a yoke therein,

said resilient portions being deflectable upon insertion of a yokewithin the ring and supporting the yoke in a fixed position relative tothe ring axis, while permitting free axial motion of the yoke.

5. A device for positioning a deflection yoke in accordance with claim 4wherein said retainer ring is provided with pad foot portions forsecuring the ring to the cathode-ray tube and wherein double'sidedadhesive tape is secured to the pad foot portions for mounting the ringto the cathode-ray tube.

6. A device for positioning a deflection yoke in accordance with claim 5wherein said integral resilient portions comprise cantilever-type tabsextending in a direction generally toward said pad foot portions andbeing angled radially inwardly toward the axis of said retainer ring.

7. A one-piece device for positioning a deflection yoke about the gunportion of a cathode-ray tube comprising:

a molded support formed of a plasticlike material,

said support having a collar portion and a number oflegs ex tendingaxially away from the collar portion,

said legs each having an inner contact portion angled relative to theaxis of the ring to conform generally to a mating surface of thecathoderay tube,

said collar portion having resilient tabs extending inwardly of theinner surface of the collar portion to coact with a deflection yoke forpositioning the yoke about the gun portion of said cathode-ray tube.

8. A one-piece device for positioning a deflection yoke in accordancewith claim 7 wherein said resilient labs are aligned radially with thelegs and provide firm support means transversely of the axis ofthe ring.

9. A one-piece device for positioning a deflection yoke in accordancewith claim 8 wherein said resilient tabs are generally U-shaped with oneleg of the U being integrally formed with the collar portion and theother leg of the U being a free end extending generally toward saidlegs.

10. A one-piece device for positioning a deflection yoke in accordancewith claim 7 wherein the inner surface of said collar portion has aseries of guide ribs formed generally axially thereof to guide a yokeinto position within the retainer and prevent pivoting of the yoketherein.

11. A one-piece device for positioning a deflection yoke in accordancewith claim 10 wherein flange stops are provided at the leg side of thecollar to limit the axial position of the deflection yoke.

f i t

1. A device for positioning a deflection yoke about the gun portion of acathode-ray tube comprising: a retainer ring having a plurality ofresilient yoke-centering means spaced circumferentially thereabout forpositioning a yoke internally of the ring, and means for securing theretainer ring about the gun portion of a cathode-ray tube, saidresilient yoke-centering means being secured to a wall of the ring andprotruding radially inwardly thereof to coact with the deflection yokefor centering the same, said deflection yoke being readily removablypositionable within said ring against said resilient yoke-centeringmeans.
 2. A device for positioning a deflection yoke in accordance withclaim 1 wherein said resilient yoke-centering means is formed integrallywith said retainer ring.
 3. A device for positioning a deflection yokein accordance with claim 2 wherein said retainer ring has leg portionshaving surfaces shaped generally to conform to the mating surface areasof the cathode-ray tube, and pressure-sensitive adhesive means securedto said surfaces of the leg portions to rigidly secure the retainer ringto the cathode-ray tube.
 4. A device for positioning a deflection yokeabout the gun portion of a cathode-ray tube comprising: a retainer ringformed of a thermoplastic substance and having a plurality of integralresilient portions extending radially inwardly of the ring forpositioning a yoke therein, said resilient portions being deflectableupon insertion of a yoke within the ring and supporting the yoke in afixed position relative to the ring axis, while permitting free axialmotion of the yoke.
 5. A device for positioning a deflection yoke inaccordance with claim 4 wherein said retainer ring is provided with padfoot portions for securing the ring to the cathode-ray tube and whereindouble-sided adhesive tape is secured to the pad foot portions formounting the ring to the cathode-ray tube.
 6. A device for positioning adeflection yoke in accordance with claim 5 wherein said integralresilient portions comprise cantilever-type tabs extending in adirection generally toward said pad foot portions and being angledradially inwardly toward the axis of said retainer ring.
 7. A one-piecedevice for positioning a deflection yoke about the gun portion of acathode-ray tube comprising: a molded support formed of a plasticlikematerial, said support having a collar portion and a number of legsextending axially away from the collar portion, said legs each having aninner contact portion angled relative to the axis of the ring to conformgenerally to a mating surface of the cathode-ray tube, said collarportion having resilient tabs extending inwardly of the inner surface ofthe collar portion to coact with a deflection yoke for positioning theyoke about the gun portion of said cathode-ray tube.
 8. A one-piecedevice for positioning a deflection yoke in accordance with claim 7wherein said resilient tabs are aligned radially with the legs andprovide firm support means transversely of the axis of the ring.
 9. Aone-piece device for positioning a deflection yoke in accordance withclaim 8 wherein said resilient tabs are generally U-shaped with one legof the U being integrally formed with the collar portion and the otherleg of the U being a free end extending generally toward said legs. 10.A one-piece device for positioning a deflection yoke in accordance withclaim 7 wherein the inner surface of said collar portion has a series ofguide ribs formed generally axially thereof to guide a yoke intoposition within the retainer and prevent pivoting of the yoke therein.11. A one-piece device for positioning a deflection yoke in accordancewith claim 10 wherein flange stops are provided at the leg side of thecollar to limit the axial position of the deflection yoke.